Blending Colors RGB Mixing (no video)

I am trying to make a simple color mixer. I want to have a different color on each slider and as i push the slider the color get brighter. I want to be able to mix/ blend the colors by pushing up various sliders. This is what a lighting artist traditionally does with cans and a mixer.

In my current patch when I move the sliders, the color changes from one to another. This is not what I want, and I can’t for the life of me figure out how to implement the above goal. Any help would be much appreciated, I have been combing the forums for days, and have not found the answer yet.

– Pasted Max Patch, click to expand. –

Copy all of the following text. Then, in Max, select New From Clipboard.